Construction vehicle

ABSTRACT

Disclosed is a construction vehicle provided with a first exhaust gas treatment apparatus which is connected to the input side of the exhaust pipe of engine and includes the diesel oxidation catalyst device and the diesel particulate filter device, and a second exhaust gas treatment apparatus which is connected to the output side of the first exhaust gas treatment apparatus and includes the selective catalytic reduction device, and a mixing pipe which is installed between the output side of the first exhaust gas treatment apparatus and the input side of the second exhaust gas treatment apparatus and includes the urea water injection device, wherein the first exhaust gas treatment apparatus is disposed farther away from the engine than the second exhaust gas treatment apparatus, and the second exhaust gas treatment apparatus is positioned at the upper side of the first exhaust gas treatment apparatus. The construction vehicle according to the disclosure has the efficient configuration of the exhaust gas treatment apparatus installed in the one side of the diesel engine, which can reduce the width in the axial direction of the engine, thereby not only improving the installation workability of the exhaust gas treatment apparatus, but allowing the efficient inspection and maintenance of the exhaust gas treatment apparatus.

TECHNICAL FIELD

The present invention relates to a construction vehicle provided with anexhaust gas treatment apparatus for reducing the air pollution gasesgenerated in the diesel engine.

BACKGROUND OF THE INVENTION

The diesel engine used for the construction vehicle generates theexhaust gas, particularly, due to the incomplete combustion, the exhaustgas with carbon monoxide or hydrocarbon of the relatively less amountand with nitrogen oxide of the relatively more amount.

The diesel engine is provided with the exhaust gas treatment apparatusfor purifying the exhaust gas, which comprises the devices such as DOC(Diesel Oxidation Catalyst) which converts carbon monoxide orhydrocarbon into carbon dioxide or water, DPF (Diesel ParticulateFilter) which collects the particulate matters like dust to be burntoff, and SCR (Selective Catalytic Reduction) which converts nitrogenoxide to into nitrogen or water, etc.

The exhaust gas treatment apparatus may comprise only DPF or thecombination of DOC and DPF, which recently further comprises SCRprovided with the urea water injection system for the reduction ofnitrogen oxide according to the strict regulation of the exhaust gas.

On the other hand, in the conventional exhaust gas treatment apparatus,SCR and the integral combination of DOC with DPF are configured inparallel with each other in the upper side of the cowl frame connectedto the upper frame, which due to the small space, makes theinstallation, inspection and replacement of the devices difficult.

SUMMARY OF THE INVENTION

Accordingly, the present invention has been made to solve theaforementioned problems occurring in the related art, and it is anobject of the present invention to provide the construction vehicle thatmakes better use of the space for installing the exhaust gas treatmentapparatus and allows the more efficient maintenance of the same bydisposing the exhaust gas treatment apparatus in more efficient way.

TECHNICAL SOLUTION

To achieve the above and other objectives, in accordance with anembodiment of the present invention, there is provided with a firstexhaust gas treatment apparatus which is connected to the input side ofthe exhaust pipe of engine and includes the diesel oxidation catalystdevice and the diesel particulate filter device, a second exhaust gastreatment apparatus which is connected to the output side of said firstexhaust gas treatment apparatus and includes the selective catalyticreduction device, and a mixing pipe which is installed between theoutput side of the first exhaust gas treatment apparatus and the inputside of the second exhaust gas treatment apparatus with the urea waterinjection device on either side thereof.

The first exhaust gas treatment apparatus is disposed farther away fromthe engine than the second exhaust gas treatment apparatus which ispositioned at the upper side of the first exhaust gas treatmentapparatus.

Preferably, a plate is further provided having the slope correspondingto the configuration arranging the first exhaust gas treatment apparatusand the second exhaust gas treatment apparatus that are fixed at the topsurface of the plate with the bottom surface of the plate interconnectedwith the cowl frame connected to the upper frame.

More preferably, a first bracket and a second bracket are furtherprovided on the top surface of the plate and have the grooves to seatthe first exhaust gas treatment apparatus and the second exhaust gastreatment apparatus.

More preferably, at least one of the fixing members are further providedat both the upper ends of the first bracket and the second bracket tofix said first exhaust gas treatment apparatus and said second exhaustgas treatment apparatus while covering the outer circumferences thereof.

More preferably, the first exhaust gas treatment apparatus and thesecond exhaust gas treatment apparatus are disposed in overlappingappearance when viewed from the above.

ADVANTAGEOUS EFFECT

The construction vehicle provided with the exhaust gas treatmentapparatus according to the disclosure has the following effect.

As the first exhaust gas treatment apparatus is installed on the platein such configuration that the same is positioned farther away from theengine than the second exhaust gas treatment apparatus, and is placedunderneath the second exhaust gas treatment apparatus, thus forming theintegral structure with the bottom surface of the plate assembled at thetop surface of the cowl frame connected to the upper frame, the exhaustgas treatment apparatus can be installed efficiently by making betteruse of the space and the maintenances such as the inspection andreplacement of the diesel particulate filer can be made moreefficiently.

Moreover, the effect described above is apparently exhibited regardlessof whether or not the inventor recognizes it, and therefore is only theexample disclosed without including all other effects that can takeplace in reality.

In addition, the effect disclosed should be understood by the overalldescription of the invention and the effects that are not disclosed butthe ordinary person in the art can recognize from the present disclosureare taken as the effects disclosed according to the description of thepresent invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is the perspective view of the exhaust gas treatment apparatusprovided in the construction vehicle according to an embodiment of thedescription.

FIG. 2a is the side view of the exhaust gas treatment apparatusinstalled according to an embodiment of the description.

FIG. 2b is the another side view of exhaust gas treatment apparatusinstalled according to an embodiment of the description.

FIG. 3 is the partial perspective view of the configuration of theexhaust gas treatment apparatus according to an embodiment of thedescription.

*EXPLANATION OF REFERENCE NUMERALS FOR MAIN PARTS IN THE DRAWING

-   100: first exhaust gas treatment apparatus 110: first housing-   111, 211: input side 112: output side-   113: diesel oxidation catalyst device 114: diesel particulate filter-   200: second exhaust gas treatment apparatus 210: second housing-   212: selective catalytic reduction device 300: mixing pipe-   400: engine 410: exhaust pipe-   500: plate 510: first bracket-   520: second bracket 530: seat groove-   540: fixing member 600: cowl frame-   700: upper frame

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, the preferred embodiments according to the presentinvention will be described in detail with reference to the accompanyingdrawings.

Although the present invention has been described with reference to thepreferred embodiment in the attached figures, it is to be understoodthat various equivalent modifications and variations of the embodimentscan be made by a person having an ordinary skill in the art withoutdeparting from the spirit and scope of the present invention as recitedin the claims.

Furthermore, the size and shape of the element shown in the drawing mayhave been enlarged for the convenience and clarity of the description.The terminologies defined specifically in the present invention can bechanged depending on the intention or convention of the users, and thedefinition of the terminology should be understood base on the overalldescription.

The construction vehicle according to an embodiment of the presentinvention comprises the first exhaust gas treatment apparatus connectedto the exhaust pipe of the diesel engine, the second exhaust gastreatment apparatus connected to the first exhaust gas treatmentapparatus and the mixing pipe to interconnect the first exhaust gastreatment apparatus with the second exhaust gas treatment apparatus.

As shown in FIG. 1, the first exhaust gas treatment apparatus (100)connected to the exhaust pipe (410) includes the diesel oxidationcatalyst device (113) and the diesel particulate filter (114). Thediesel oxidation catalyst device oxidizes the carbon monoxide and thehydrocarbon by the catalyst, and converts them to the carbon dioxide andwater.

The diesel particulate filter consists of the porous grids, passes theair, and filters the particulate matters of air pollutants. When the airpollutants are collected, the backpressure increases with the outputdecreased, which are read by the differential pressure sensor and thetemperature sensor, etc. The air pollutants thus collected are burnt offby the regeneration process based on the differential pressure and thedriving distance, etc. and are prevented from being emitted into theair.

The first exhaust gas treatment device (100) contains the dieseloxidation catalyst device (113) and the diesel particulate filter (114)sequentially within the first housing (110) in which the input side ofthe same where the diesel oxidation catalyst device (113) is positionedis connected to the exhaust pipe (410) while the output side of the samewhere the diesel particulate filter (114) is positioned is connected tothe second exhaust gas treatment apparatus (200) through the mixing pipe(300) described below.

The second exhaust gas treatment apparatus (200) includes the selectivecatalytic reduction device (212). The second exhaust gas treatmentapparatus (200) is employed for the reduction of nitrogen oxide in thehazardous exhaust gas, in which the urea water is injected into theexhaust gas of the high temperature at the front end of the catalyst andthe ammonia is generated by the thermal decomposition and hydrolysis,which then reacts with the nitrogen oxide within the catalyst makingnitrogen and water.

The second exhaust gas treatment apparatus (200) according to anembodiment of the present invention comprises the second housing (210)including the diesel catalytic reduction device (212), in which theinput side of the same is connected to the first exhaust gas treatmentapparatus (100) through the mixing pipe (300) while the output side ofthe same is connected to the tail pipe.

The mixing pipe (300) interconnects the first exhaust gas treatmentapparatus (100) with the second exhaust gas treatment apparatus (200),in which the urea water is injected to reduce the nitrogen oxide.

The mixing pipe (300) interconnects the first exhaust gas treatmentapparatus (100) with the output side (112) of the first housing (110)and the second exhaust gas treatment apparatus (200) with the input side(211) of the second housing (210), respectively, and on either side ofthe mixing pipe (300) is installed the urea water injection device toinject the urea water to the exhaust gas.

The first exhaust gas treatment apparatus (100) and the second exhaustgas treatment apparatus (200) are disposed in the one side of the upperframe (700) with engine (400) installed. The first exhaust gas treatmentapparatus (100) is disposed at the upper side of the second exhaust gastreatment apparatus (200) and positioned either farther away or closerto the engine (400) than the second exhaust gas treatment apparatus(200).

If necessary, the first exhaust gas treatment apparatus (100) may bedisposed at the lower side of the second exhaust gas treatment apparatus(200) and positioned either farther away or closer to the engine (400)than the second exhaust gas treatment apparatus (200).

The example according to the disclosure represents the configuration inwhich the second exhaust gas treatment apparatus (200) is disposed atthe upper side of the first exhaust gas treatment apparatus (100) andpositioned closer to the engine (400) than the first exhaust gastreatment apparatus (100). Such configuration can minimize the width inthe axial direction of the engine (400) allowing better use of the spacefor the installation of the first exhaust gas treatment apparatus (100)and the second exhaust gas treatment apparatus (200).

According to the example of the disclosure, the first exhaust gastreatment apparatus (100) and the second exhaust gas treatment apparatus(200) are disposed with the axes in the length direction fullyoverlapped when viewed from the above. However, as shown in FIG. 2a ,the first exhaust gas treatment apparatus (100) and the second exhaustgas treatment apparatus (200) can be disposed with the axes in thelength direction not overlapped for the inspection and maintenance ofthe first exhaust gas treatment apparatus (100), or as shown in FIG. 2b, partially overlapped.

As shown in FIG. 3, the first exhaust gas treatment apparatus (100) andthe second exhaust gas treatment apparatus (200) are installed on theplate (500) forming the integral structure in which the plate (500) canbe fixed onto the upper frame (700) with the engine (400) installed, orpreferably, onto the cowl frame (600) interconnected perpendicularly tothe upper frame (700) as shown in FIG. 1.

The plate (500) has the slope corresponding to the configuration of thefirst exhaust gas treatment apparatus (100) and the second exhaust gastreatment apparatus (200) and, on the top surface of the plate (500) isprovided the first bracket (510) and the second bracket (520) for thefirst exhaust gas treatment apparatus (100) and the second exhaust gastreatment apparatus (200) to be seated, respectively.

The bottom surface of the plate (500) is clamped in contact with the topsurface of the cowl frame (600) by the clamping means, and so it ispreferable to configure the bottom surface of the plate (500)corresponding to the top surface of the cowl frame (600).

The first bracket (510) and the second bracket (520) have the grooves(530) at the upper side thereof to seat the first exhaust gas treatmentapparatus (100) and the second exhaust gas treatment apparatus (200).Such grooves are configured corresponding to the outer circumferenceshapes of the first housing (110) and the second housing (210) so as tomake the contact areas between the grooves (530) and the first housing(110) and the second housing (210), respectively, maximized for thestable seating.

On the opposite ends of the upper sides of the first bracket (510) andthe second bracket (520) are installed the fixing members (540) whichcover and fix the outer circumferences of the first housing (110) andthe second housing (210).

The fixing members (540) may consist of a plurality of the same for thestable fixing of the first housing (110) and the second housing (210),and the shape of fixing member and the clamping method could bevariously selected.

The installation procedure of the exhaust gas treatment apparatus willbe described below.

The first exhaust gas treatment apparatus (100) and the second exhaustgas treatment apparatus (200) are fixed on the first bracket (510) andthe second bracket (520) of the plate (500), respectively, forming theintegral structure wherein the second exhaust gas treatment apparatus(200) is positioned at the upper side of the first exhaust gas treatmentapparatus (100) and has the slanted configuration towards the engine(400).

The plate (500) is interconnected with the top surface of the cowl frame(600) which is fixed perpendicularly to the one side of the upper frame(700) while the first exhaust gas treatment apparatus (100) is connectedto the exhaust pipe (410) of the engine (400).

Thus, as the first exhaust gas treatment apparatus (100) and the secondexhaust gas treatment apparatus (200) are fixed on the first bracket(510) and the second bracket (520) of the plate (500) by the fixingmembers (540), forming the integral structure, the installation of theexhaust gas treatment apparatus can be made simple and due to the enoughroom along the length direction of the engine (400), the installationefficiency can be increased allowing the inspection or replacement ofthe diesel particulate filter (114) to be done readily without theinterference with the surrounding devices.

The treatment process of the exhaust gas is as follows.

The exhaust gas is delivered to the exhaust pipe (410) and passesthrough the diesel oxidation catalyst device (113) of the first exhaustgas treatment apparatus (100) where the hydrocarbon and the carbonmonoxide are reduced by the oxidation catalysis while the particulatematters are filtered by the diesel particulate filter (114) of the firstexhaust gas treatment apparatus (100) and burnt off periodically leavingthe ash to be cleaned.

The exhaust gas passing through the diesel particulate filter (114) isdelivered to the mixing pipe (300) where the urea water is injected, andthe nitrogen oxide is converted into the nitrogen and water in thesecond exhaust treatment apparatus (200) connected to the mixing pipe(300).

While the present invention has been described regarding practicalembodiments, it is to be understood that the invention is intended tocover various modifications. Therefore, the scope of the invention isnot limited to the disclosed embodiments and shall be determined by notonly the claims appended, but the equivalent arrangements.

INDUSTRIAL APPLICABILITY

The construction vehicle according to the present invention is providedwith the efficient configuration of the exhaust gas treatment apparatusinstalled in the one side of the diesel engine, which can reduce thewidth in the axial direction of the engine, thereby not only improvingthe installation workability of the exhaust gas treatment apparatus, butallowing the efficient inspection and maintenance of the exhaust gastreatment apparatus.

What is claimed is:
 1. An exhaust gas treatment apparatus used for aconstruction vehicle for reducing the air pollutants of the dieselengine, comprising; a first exhaust gas treatment apparatus which isconnected to the input side of the exhaust pipe of engine and includesthe diesel oxidation catalyst device (DOC) and the diesel particulatefilter device (DPF), a second exhaust gas treatment apparatus which isconnected to the output side of said first exhaust gas treatmentapparatus and includes the selective catalytic reduction device (SCR),and a mixing pipe which is installed between the output side of saidfirst exhaust gas treatment apparatus and the input side of said secondexhaust gas treatment apparatus and includes the urea water injectiondevice, wherein said first exhaust gas treatment apparatus is disposedfarther away from the engine than said second exhaust gas treatmentapparatus, and said second exhaust gas treatment apparatus is positionedat the upper side of said first exhaust gas treatment apparatus.
 2. Theexhaust gas treatment apparatus of claim 1, further comprising, a platehaving the slope corresponding to the configuration arranging said firstexhaust gas treatment apparatus and said second exhaust gas treatmentapparatus which are fixed at the top surface of the plate while thebottom surface of the plate is interconnected with the top surface ofthe cowl frame positioned to the one side of the upper frame.
 3. Theexhaust gas treatment apparatus of claim 2, further comprising, a firstbracket and a second bracket which have the grooves to seat said firstexhaust gas treatment apparatus and said second exhaust gas treatmentapparatus, respectively, while the first bracket and the second bracketare placed on the top surface of said plate.
 4. The exhaust gastreatment apparatus of claim 3, further comprising, at least one offixing members which are placed at the opposite upper ends of said firstbracket and said second bracket so as to fix said first exhaust gastreatment apparatus and said second exhaust gas treatment apparatuswhile covering the outer circumferences thereof.
 5. The exhaust gastreatment apparatus of claim 1, wherein said first exhaust gas treatmentapparatus and said second exhaust gas treatment apparatus are disposedwith at least one part thereof overlapped when viewed from the above.